Mainframe computers don't have a problem with multi-tasking, but personal computers always work slower when they have to do more than one job at the same time. At least that is my experience in spite of all the years of talking about multi-tasking. For instance, when my AVG scanner suddenly starts running everything starts working slow. This is what AMD says : Does the "AMD Athlon 64 X2 Dual-Core Processor" really makes a difference for multi-tasking and which one do I have to buy to make a real difference, because they aren't cheap either ? Is there really an improvement in multi-tasking during all these years ? I never noticed it.